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DOG PROOF - 21m's of fence & 5.87m gate.

Require a dog proof gate & fence for a growing doggo. Ground is flat/level. Fence & gate would need to be 1.8m high for dog. Gate will need to span 5.87meters long(not sure on material) - could be a split gate. Just needs to be dog escape proof/reliable. Two posts already exist where I'd like the gate(not sure of their strength - see pics). The fence would need to be 17.96m's long. Following along the edge of driveway to my garage and then a smaller 1.3m fence to block an escape point for the dog. I'm assuming timber is the cheapest option. Feel free to quote me an alternative material. Open to offers/alternative plans. See pictures.